separate mac and linux vim keymaping

vim/settings/yadr-keymap-mac.vim

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+" ========================================
+" Mac specific General vim sanity improvements
+" ========================================
+"
+" ========================================
+" RSI Prevention - keyboard remaps
+" ========================================
+" Certain things we do every day as programmers stress
+" out our hands. For example, typing underscores and
+" dashes are very common, and in position that require
+" a lot of hand movement. Vim to the rescue
+"
+" Now using the middle finger of either hand you can type
+" underscores with apple-k or apple-d, and add Shift
+" to type dashes
+imap <silent> <D-k> _
+imap <silent> <D-d> _
+imap <silent> <D-K> -
+imap <silent> <D-D> -
+
+" Change inside various enclosures with Cmd-" and Cmd-'
+" The f makes it find the enclosure so you don't have
+" to be standing inside it
+nnoremap <D-'> f'ci'
+nnoremap <D-"> f"ci"
+nnoremap <D-(> f(ci(
+nnoremap <D-)> f)ci)
+nnoremap <D-[> f[ci[
+nnoremap <D-]> f]ci]
+
+" ==== NERD tree
+" Cmd-Shift-N for nerd tree
+nmap <D-N> :NERDTreeToggle<CR>
+
+" move up/down quickly by using Cmd-j, Cmd-k
+" which will move us around by functions
+nnoremap <silent> <D-j> }
+nnoremap <silent> <D-k> {
+autocmd FileType ruby map <buffer> <D-j> ]m
+autocmd FileType ruby map <buffer> <D-k> [m
+autocmd FileType rspec map <buffer> <D-j> }
+autocmd FileType rspec map <buffer> <D-k> {
+autocmd FileType javascript map <buffer> <D-k> }
+autocmd FileType javascript map <buffer> <D-j> {
+
+" Command-/ to toggle comments
+map <D-/> :TComment<CR>
+imap <D-/> <Esc>:TComment<CR>i
+
+" Use numbers to pick the tab you want (like iTerm)
+map <silent> <D-1> :tabn 1<cr>
+map <silent> <D-2> :tabn 2<cr>
+map <silent> <D-3> :tabn 3<cr>
+map <silent> <D-4> :tabn 4<cr>
+map <silent> <D-5> :tabn 5<cr>
+map <silent> <D-6> :tabn 6<cr>
+map <silent> <D-7> :tabn 7<cr>
+map <silent> <D-8> :tabn 8<cr>
+map <silent> <D-9> :tabn 9<cr>
+
+" Create window splits easier. The default
+" way is Ctrl-w,v and Ctrl-w,s. I remap
+" this to vv and ss
+nnoremap <silent> vv <C-w>v
+nnoremap <silent> ss <C-w>s
+
+" Resize windows with arrow keys
+nnoremap <D-Up> <C-w>+
+nnoremap <D-Down> <C-w>-
+nnoremap <D-Left> <C-w><
+nnoremap <D-Right>  <C-w>>
+
+" ============================
+" Tabularize - alignment
+" ============================
+" Hit Cmd-Shift-A then type a character you want to align by
+nmap <D-A> :Tabularize /
+vmap <D-A> :Tabularize /
+
+" Source current file Cmd-% (good for vim development)
+map <D-%> :so %<CR>